Furnace.



' B. RUGGLES.

FURNACE.

APPLICATIONFILED sPT.17,1910.

Patented Aug. 24, 1915.

2 SHEETSSHEET l- Arm/mm RUGGLES.

FURNACE.

APPLICATION FILED SEPT. 11. 19.10.

Patented Aug. 24:, 1915.

2 SHEETS-SHEET 2.

WI TIJESSES WILLIAM BARKER RUGGLES, 0F BAYONNE, NEW JERSEY.

FURNACE.

Specification of Letters Patent.

Patented Aug. 24, 1915.

Application filed September 17, 1910. Serial No. 582,448.

naces, of which the following is a full, clear,

and exact description, such as will enable others skilled in the art towhich it appertains to make and'use the same.

This invention relates to furnaces, and with regard to its more specificfeatures, to portable furnaces.

One object of the invention is the provision of a simple and eflicientfurnace, which though generally useful, is peculiarly adapted to driers,and especially to driers of the portable type, in that it is of suchsubstantial construction that it may be readily transferred from placeto place without impairing its efficiency; is of comparatively lightweight and small size but great heating capacity; and is one whereinintense heat may be developed without burning out the combustionchamber.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings, forming part of this specification andwherem 1s illustrated one of the various possible embodiments of theinvention, Figure l is a front end elevation of the furnace; Fig. 2 is asection on line 13-13, Fig. 1; Fig. 3 is a section on line OO, Fig. 2;Fig. 4 is a rear end elevation of the furnace.

Similar reference characters are employed to indicate similar partsthroughout the several views.

The furnace 28 comprises a generally cylindrical metallic structurehaving a substantially plane front and back. Three curved angle ironarches 54, and 56, spaced apart, rest with their'ends upon the channelbars 57, supported in turn by legs 58 having lugs 59 which are adaptedto rest on a suitable support, such as bars 1 forming a portion of avehicle frame, the whole presenting a generally cylindricalskeletonstructure or base. Conforming and secured to the outside of this archedframework is a metallic cover or casing 60. Also conforming and securedto the arches is an inside metallic casing or body portion 61.

The cover 60 has, at the top of the furnace, a longitudinal opening 62extending the full length of the furnace, the margin of the opening inthe cover being braced by angle irons secured thereto. Bolts connectthese angle irons across the opening, bracing and holding the parts.

On the inside of the body portion 61 at a suitable height are securedangle irons 63 adapted to support the fire brick lining 64, whichconforms to the arch form of the furnace and extends inwardly at thebase of the front of the furnace are curved angle irons 67 serving tosupport and secure the curved plate 68 which forms the bottom of the ashpit and the furnace, and is in effect a continuation of'the body portion61. At its longitudinal central portion the wall of the ash pit isbraced by a conforming metallic strip 69, secured thereto and to thecentral arched angle bars.

The inside metallic lining 61, in connec-- tion with the casing 60,constitutes a jacket for the combustion chamber of the furnace, andopenings or passageways 70 are provided on each side of the furnaceconnect ing the jacket with the ash pit, and, through the grateopenings, with the combustion chamber.

The front is preferably formed in three pieces 71, 72 and 73 securedtogether by the angle bar straps 74,75 and 76 and to the front archedangle bar. Suitable openings and doors are provided for the combustionchamber and ash pit. In the present instance each door casing is formedof two castings 77 and 78, between which the edges of the front platesare fastened. The casting 78 is partially arched and extends into thefurn'ace a sufiicient'distance to support the fire brick lining at thispoint, a transverse angle iron supporting the fire brick lining betweenthe door and the periphery of the furnace. The brick lining at the rearof the combustion chamber is supported by transversely secured angleirons 7 9 and the grate bearers located at that point. Besides securingthe front plates and doors in position, the straps 7 4, 7 5 and 7 6serve to stiffen the entire structure, it being noted that the straps 76are almost directly beneath the edges of the opening 62.

The back plate of the furnace is provided with an opening 80 surroundedby a flange 81, and a collar 82 secures the furnace smoke flue 27 to theflange. The discharge opening 80 and the flue are lined withvfire brick,and the flue extends at an angle to the back of the furnace toaccommodate the inclination of the drier drum (not shown) to which thefurnace may be connected. It will also be noted that the axis of thecurved or cylindrical walls of the furnace being horizontally disposed,the elements are located in a most advantageous position for resisting"ertical strains suchas would be occasioned by the weight of theelements themeselves especially when supported at separate points as bymeans of the legs disposed as described. The inner casing of the furnacecomprising the plate 68, provides an inner endless wall which is endlesstransversely, that is, in a direction around the axis referred to andwhich is continuous around the furnace save for the passageways providedbetween the adjacent edges of the plates 61 and 68. The

outer casing, or wall, 60 extends over more than the semi-circumferenceof the inner cylinder, or casing, thus not only providing a large amountof heating surface as referred to above, but also thus being in positionto more efiiciently resist vertical strains tending to separate thecasings. Secured at the top of the furnace is a framework 33 composed ofangle irons which may be utilized to support auxiliary parts of a drier,such as a fan, a conveyer, etc.

By the above construction the air for combustion enters the furnace viathe opening in the top, passing around the combustion chamber to a pointbeneath the grate, thence into the ash pit and through the openings inthe grate to the combustion chamber. The air is therefore heated by thewalls of the combustion chamber, and thus less heat in the combustionchamber is necessary to raise the temperature of the air, the otherwisewasted heat units being made available not only in the furnace but inthe drier into which the products of combustion may subsequently enter.Furthermore, the heating of the air in the jacket cools the Walls of thecombustion chamber, enabling a much thinner lining of fire brick to beused, and reducing the size and weight of the furnace considerably,besides lessening expense for materials. It will be observed that theair acket extends below, or beyond the combustion chamber in order toobtain all the tion could be made without departing from the scopethereof, it is intended that all matter contained in the abovedescription or shown inv the accompanying drawings shall be interpretedas illustrative and not in a limiting sense. It is also to be understoodthat the language used in the following claims is intended to cover allof the generic and specific features of the invention herein describedand all statements of the scope of the invention, which, as a matter oflanguage, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secureby Letters Patent is I 1. In an apparatus of the character described, incombination, inner and outer' curved metallic walls spaced apart anddisposed so that the axes of curvature are substantiallyhorizontal, theinner wall being endless in the direction around the axes, and

a grate disposed to provide a combustion chamber and an ash pit withinthe inclosure formed by said inner wall, said endless wall comprising apassageway connecting the space below the grate with the space betweensaid inner and outer walls, one of said walls having an opening for theentry of air to the space between said walls.

2. In an apparatus of the character described, in combination, front andback walls, curved supporting irons carried by said front and backwalls, inner and outer curved metallic walls spaced apart and disposedso that the axes of curvature are substantially horizontal, the innerwall being endless in the directionaround the axes and comprising aportion secured to said irons, and a grate disposed to provide acombustion chamber and an ash pit within the inclosure formed by saidinner wall, said end: less wall comprising a passageway connecting thespace below the grate with the space between said inner and outer walls,and one of said walls having an opening for the entry of air to thespace between said walls.

3. In an apparatus of the character described, inner and outer curvedmetallic walls spaced apart and disposed so that the axes of curvatureare substantially horizontal, the inner wall being endless in thedirection around the axes, longitudinally disposed supporting ironssecured to the inner wall, and projecting into the space surrounded bysaid wall at a line below the semi-diameter of the space surrounded bysaid inner wall, a curved refractory lining and grate bearers resting onsaid irons, and a grate resting on said bearers, thereby providing acombustion chamber and an ash pit within the inclosure formed by saidinner wall, said endless wall comprising a passageway connectingthespace below the grate with the space between said inner and outerWalls, one of said walls having an opening for the entry of air to thespace between said walls.

4:. In combination, in a furnace, a casing comprising inner and outercurved metallic walls spaced apart and disposed so that the axes ofcurvature are substantially horizontal, the inner wall being endlessaround the axes, longitudinally disposed angle irons secured to theinner wall and projecting into the space surrounded by said wall, saidirons having transverse slots, lugs opposite said slots, a refractorylining for the combustion chamber resting on said irons, grate bearersresting on said lugs, a grate supported by said bearers, and apassageway below said irons connecting the space between the inner andouter walls with the space below the grate, said casing having anopening for the entry of air to the space between said walls.

5. In combination, in afurnace, a casing comprising an innertransversely endless cylindrical metallic wall, a grate providing acombustion chamber and an ash pit within the space inclosed by saidwall, an outer cylindrical metallic wall spaced apart from said wall andforming with the inner wall an air jacket around the combustion chamber,a refractory lining for the combustion chamber, a plurality of metallicplates forming a front wall, a door casing intersecting the front walland comprising separate members, the edges of said plates being securedbetween said members, oppositely disposed passageways connecting thespace below the grate with the air jacket, said jacket having an openingintermediate said passageways for the entry of air.

6. In combination, in a furnace, horizontally disposed supporting ironsspaced apart, vertically disposed curved irons connected to each of saidhorizontal irons and spaced horizontally'from each other, curvedmetallic plates providing a transversely endless wall secured to theinner faces of said curved irons and bridging the space therebetweenforming a combustion chamber, and curved metallic plates secured to theouter faces of said irons bridging the space therebetween, one end ofsaid latter plates terminating at the horizontal irons, and the oppositeends spaced apart, the endlesswall comprising openings communicatingwith the ash pit.

7. A furnace comprising, in combination,

a cylindrical body portion divided into a combustion chamber and an ashpit, a cover having an air inlet opening spaced from the body portion toform an air acket adjacent the combustion chamber, and extending beyondthe combustion chamber, a passageway leading from the space between thebody and cover to the ash pit, and means abutting the ends of the airjacket to support the furnace.

8. A furnace of the character described, comprising, in combination,vertically disposed curved angle iron bars, a metallic body portionconforming to the curvature of said bars and secured thereto, angleirons extending through the furnace and secured to the body portion, andhaving slots, lugs opposite said slots, grate bearers adapted to rest onsaid lugs, and a grate on said bearers.

In testimony whereof I affix my signature, in presence of two witnesses.

WILLIAM BARKER RUGGLES.

Witnesses LAURA E. SMITH, JAMES K. Townns.

